Journal article
Room-Temperature Tuning of Mid-Infrared Optical Phonons and Plasmons in W-doped VO2 thin films
Optical materials, Vol.154, 115732
08/2024
DOI: 10.1016/j.optmat.2024.115732
Abstract
The development of mid-infrared nanophotonics relies on the availability of new materials combining metal- and insulator-like optical features. We systematically studied the phase transition of thermochromic vanadium dioxide (VO2) using substitutional tungsten doping at room temperature. Our results reveal that vanadium dioxide thin films, doped with tungsten and grown via pulsed laser deposition techniques on sapphire substrates, can be precisely engineered to exhibit tailored infrared phonon and plasmon polaritonic responses. By controlling the extent of tungsten concentration, starting from VO2-WO3 cold-pressed powder targets, we demonstrate the ability to continuously adjust both the amplitude and frequency of optical phonon resonances. Furthermore, we observe tunable free-electron response due to varying tungsten concentrations. The adopted fabrication technique makes it possible to create multilayer structures by alternating layers with different concentrations of tungsten. Our results pave the way for the development of tunable mid-infrared metamaterial devices operating at room-temperature.
Brief synopsis of graphical abstract:W-doped Vanadium dioxide thin films, prepared by pulsed laser deposition, can be precisely engineered to exhibit tailored infrared phonon and plasmon polaritonic responses at room temperature Within this framework, this study represents a guide for the predictive design of films with a given degree of semiconducting/metallic behaviour, thus paving the way for the development of VO2 based, tunable mid-infrared metamaterial devices operating at room temperature. [Display omitted]
•W-doped Vanadium dioxide thin films can be precisely engineered to switch from a pure insulator behaviour to a typical metallic response at room temperature.•Both the amplitude and frequency of optical phonon resonances can be continuously adjusted by controlling W-doping level.•Tunable free-electron response is observed, due to varying tungsten concentrations, thus the limitations of plasmonics in terms of wavelength can be surpassed.•Controlling the optical properties using different W-doping level paves the way for the development of VO2 based, tunable mid-infrared metamaterial devices operating at room temperature.
Details
- Title: Subtitle
- Room-Temperature Tuning of Mid-Infrared Optical Phonons and Plasmons in W-doped VO2 thin films
- Creators
- Alessandro Bile - Sapienza University of RomeDaniele Ceneda - Sapienza University of RomeVaghefi Esfidani S. Maryam - Department of Physics and Astronomy, University of Iowa, Iowa City IA, 52242 United StatesDaniele Scirè - University of PalermoGianpiero Buscarino - University of PalermoMauro Mosca - University of PalermoDominique Persano Adorno - University of PalermoRoberto Macaluso - University of PalermoRoberto Li Voti - Sapienza University of RomeConcita Sibilia - Sapienza University of RomeThomas G. Folland - University of IowaKoray Aydin - Northwestern UniversityMarco Centini - Sapienza University of RomeMaria Cristina Larciprete - Sapienza University of Rome
- Resource Type
- Journal article
- Publication Details
- Optical materials, Vol.154, 115732
- Publisher
- Elsevier B.V
- DOI
- 10.1016/j.optmat.2024.115732
- ISSN
- 0925-3467
- eISSN
- 1873-1252
- Language
- English
- Electronic publication date
- 06/08/2024
- Date published
- 08/2024
- Academic Unit
- Physics and Astronomy
- Record Identifier
- 9984650360202771
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